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Changes in Significant Accounting Policies - Additional Information (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
Disclosure of redesignated financial assets and liabilities [line items]        
Impairment loss on trade receivables € 2,389 € 745 € 1,475 [1]  
Increase (decrease) in trade receivables € 0 € 37    
Allowance for impairment of trade receivables     10,775 € 10,812
Trade receivables [member]        
Disclosure of redesignated financial assets and liabilities [line items]        
Increase (decrease) in trade receivables     € 37  
[1] The Group has initially applied IFRS 9 as at January 1, 2018. Under the transition method chosen, comparative information has not been restated except for separately presenting impairment losses on trade receivables. See note 5(c).